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clearfix"><section class="container clearfix tcPro"><section class="home-main container clearfix"><div id="morg2xx" class="twoCol"><div id="3uhbxnb" class="page-proshow clearfix"><p class="current"> 當前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應</a>?<a href="http://www.cdcfah.com/cp/first-_yiqiyibiao/">儀器儀表</a>?<a href="http://www.cdcfah.com/cp/second-yiqiyibiao_swyqxm/">生物儀器</a>?<a href="http://www.cdcfah.com/cp/third-swyqxm_qtswyq/">其他生物儀器</a>?北京專業(yè)蛋白純化系統(tǒng)上門維修蘇州英賽斯智能科技供應</p><div id="gyzzu8j" class="leftbox clearfix"><h1>北京專業(yè)蛋白純化系統(tǒng)上門維修蘇州英賽斯智能科技供應</h1><div id="tqlw328" class="proBig"><div id="dgqwhfm" class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171674741306/6371381716747413062985954.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="du2oo24" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171674741306/6371381716747413062985954.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="8738lwa" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>江蘇省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關鍵詞：</span>北京專業(yè)蛋白純化系統(tǒng)上門維修,蛋白純化系統(tǒng)</p><p><span>***更新：</span>2020-11-10 17:08:10</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="sghsyrr" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">蘇州英賽斯智能科技有限公司</a></p><p><span>聯(lián)系人：</span>李大為</p><p><span>郵箱: </span>570745634@qq.com</p><p><span>電話: </span>18606243033</p><p><span>傳真: </span>0512_63937379</p><p><span>網(wǎng)址: </span>http://www.inscinstech.com.cn</p><p><span>手機: </span>0512-63937378</p><p><span>地址: </span>吳江經(jīng)濟技術開發(fā)區(qū)聯(lián)楊路南側、龍橋路西側</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="m89gar3" class="page-proshow02"><p class="title">詳細說明</p><div id="u25hx3j" class="box"><p><p style="text-indent:25px">蛋白質分離純化步驟（二） 2.4.3. 親和層析親和層析（affinity-chromatography）分離技術是根據(jù)許多蛋白質對特定的化學基團具有專一性結合的原理。這些能被生物大分子如蛋白質所識別并與之結合的基團稱為配基或配體（ligand）。親和層析是一種極有效的分離純化蛋白質的方法。例如酶對它的底物具有特殊的親和力；抗原和抗體互為配基，北京專業(yè)蛋白純化系統(tǒng)上門維修。以伴刀豆球蛋白A（concanavalin A）的分離純化為例，由于該蛋白對葡萄糖有專一性親和吸附，北京專業(yè)蛋白純化系統(tǒng)上門維修，因此可把葡萄糖通過適當?shù)幕瘜W反應共價地連接到像瓊脂糖凝膠一類的載體表面上，北京專業(yè)蛋白純化系統(tǒng)上門維修。為了防止載體表面的空間位阻影響待分離的蛋白質大分子與其配基的結合，在配基和載體之間往往插入一段所謂的連接臂（或稱為間隔臂，spacerarm），使配體與載體之間保持足夠的距離。將這種多糖顆粒裝入一定規(guī)格的玻璃管中就制成了一根親和層析柱。當含有伴刀豆球蛋白的提取液加到層析柱的上部，并沿柱從上往下過時，待純化的蛋白質與其特異性配基結合而被吸附到柱上，其他蛋白因不能與葡萄糖配基結合將通過柱子而流出（圖2-28a）。然后采用一定的洗脫條件，如濃的葡萄糖溶液進行洗脫，即可把該蛋白質洗脫下來，達到與其它蛋白質分離的目的。北京專業(yè)蛋白純化系統(tǒng)上門維修</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="北京專業(yè)蛋白純化系統(tǒng)上門維修,蛋白純化系統(tǒng)" src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171674741306/6371381716747413062985954.jpg"></div><p style="text-indent:25px">蛋白質分離純化步驟（二） 2.4 樣品的進一步分離純化用等電點沉淀法、鹽析法所得到的蛋白質一般含有其他蛋白質雜質，須進一步分離提純才能得到有一定純度的樣品。常用的純化方法有：凝膠過濾層析、離子交換纖維素層析、親和層析等等。有時還需要這幾種方法聯(lián)合使用才能得到較高純度的蛋白質樣品。 1. 凝膠過濾層析凝膠過濾層析（gel-filtration chromatography）又稱為分子排阻層析或分子篩層析。它是將葡聚糖凝膠（Sephadex）裝入一個柱子中，制成凝膠柱。這種凝膠顆粒具有網(wǎng)狀結構，不同類型凝膠的網(wǎng)孔大小不同。當把蛋白質混合樣品加到凝膠柱中時，比凝膠網(wǎng)孔小的蛋白質可進入網(wǎng)孔內，而大于網(wǎng)孔的分子則不能進入被排阻在凝膠顆粒之外。當用洗脫液洗脫時，被排阻的分子量大的蛋白質直接通過凝膠之間的縫隙先被洗脫下來，而比網(wǎng)孔小的蛋白質可連續(xù)不斷地進入網(wǎng)孔內。這樣的小分子不但流經(jīng)的路程長，而且受到來自凝膠內部的阻力也很大，所以蛋白質越小，從柱子上洗脫下來所需時間越長。由于不同蛋白質的分子大小不同，進入網(wǎng)孔的程度不同，因此流出的速度不同，洗脫所用體積及時間不同，從而達到分離的目的。北京專業(yè)蛋白純化系統(tǒng)上門維修</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="北京專業(yè)蛋白純化系統(tǒng)上門維修,蛋白純化系統(tǒng)" src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171877557587/6371381718775575877865772.jpg"></div><p style="text-indent:25px">蛋白質分離純化步驟（二）分離純化蛋白質的一般程序 2.1 材料的預處理及細胞破碎分離提純某一種蛋白質時，首先要把蛋白質從組織或細胞中釋放出來并保持原來的天然狀態(tài)，不喪失活性。所以要采用適當?shù)姆椒▽⒔M織和細胞破碎。常用的破碎組織細胞的方法有： 1. 機械破碎法這種方法是利用機械力的剪切作用，使細胞破碎。常用設備有，高速組織搗碎機、勻漿器、研缽等。 2. 滲透破碎法這種方法是在低滲條件使細胞溶脹而破碎。 3. 反復凍融法生物組織經(jīng)凍結后，細胞內液結冰膨脹而使細胞脹破。這種方法簡單方便，但要注意那些對溫度變化敏感的蛋白質不宜采用此法。 4. 超聲波法使用超聲波震蕩器使細胞膜上所受張力不均而使細胞破碎。 5. 酶法如用溶菌酶破壞微生物細胞等。</p><p style="text-indent:25px">蛋白質分離純化步驟（二） 2.4.2 纖維素柱層析法該法是利用蛋白質的酸堿性質作為分離的基礎。離子交換纖維素（cellulose ion-exchanger）是人工合成的纖維素衍生物，它具有松散的親水性網(wǎng)狀結構，有較大的表面積，使蛋白質大分子可以自由通過。因此常用于蛋白質的分離。（1）羧甲基纖維素（CM-纖維素）在纖維素顆粒上帶有羧甲基基團。在中性pH條件下，羧甲基上的質子可解離下來（圖2-27a），而溶液中帶正電荷的蛋白質分子可與纖維素顆粒上的羧甲基負電荷結合?？山粨Q的基團帶正電，因此是一種陽離子交換劑。蛋白質與離子交換纖維素之間結合能力的大小取決于彼此間相反電荷基團之間靜電吸引。 (2）二乙氨基乙基纖維素（DEAE-纖維素）在中性pH條件下，它含有帶正電荷的基團，可與溶液中的帶負電荷的蛋白質結合，可交換的基團帶負電荷，因此是一種陰離子交換劑。當某一蛋白質混合溶液通過裝有DEAE-纖維素的層析柱時，帶正電荷的蛋白質不能結合而隨著洗脫液的流動先被洗脫下來。帶負電荷的蛋白質將被結合到柱上。結合力取決于彼此相反電荷基團間的靜電吸引。然后選用一定pH和離子強度的緩沖液進行洗脫，改變蛋白質分子所帶的靜電荷，依次從層析柱流出達到相互分離的目的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="北京專業(yè)蛋白純化系統(tǒng)上門維修,蛋白純化系統(tǒng)" src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171347973309/6371381713479733098214210.jpg"></div><p style="text-indent:25px">三、蛋白質分子量的測定 3.2 SDS-聚丙烯酰胺凝膠電泳法測定分子量蛋白質在普通聚丙烯酰胺凝膠中的電泳速度取決于蛋白質分子大小、所帶電荷的量以及分子形狀。而SDS-聚丙烯酰胺凝膠電泳與此不同的是在樣品及電泳緩沖液中加入了十二烷基***鈉（sodium dodecylsulfate,SDS）。SDS是一種陰離子去污劑，可使蛋白質變性并解離成亞基。當?shù)鞍踪|樣品中加入SDS（一般加入量為0.1％）后，SDS與蛋白質分子結合，使蛋白質分子帶上大量的負電荷，這些電荷量遠遠超過蛋白質分子原來所帶的電荷量，因而掩蓋了不同蛋白質之間的電荷差異。所有結合SDS的蛋白質-SDS復合物的形狀近似于長的橢園棒，它們的短軸是恒定的，而長軸與蛋白質分子量的大小成正比。這樣，消除了蛋白質之間原有的電荷和形狀的差異，電泳的速度只取決于蛋白質分子量的大小。進行凝膠電泳時，常常用一種染料作前沿物質，蛋白質分子在電泳中的移動距離和前沿物質移動的距離之比值稱為相對遷移率，相對遷移率和分子質量的對數(shù)成直線關系。以標準蛋白質分子質量的對數(shù)和其相對遷移率作圖，得到標準曲線。將未知蛋白質在同樣條件下電泳，根據(jù)測得的樣品相對遷移率，從標準曲線上便可查出其分子量。樣品前處理專業(yè)蛋白純化系統(tǒng)***的選擇</p><p style="text-indent:25px">北京專業(yè)蛋白純化系統(tǒng)上門維修</p><p> 蛋白質純化方法-親和層析親和層析法包括特異性配體親和層析法以及通用性配體親和層析法。比較這兩種親和層析法。特異性配體親和層析法通常將復雜的生命大分子物質作為配體，它的結合力比較大河吸附選擇性比較強。而通用性配體親和層析法通常將簡單的小分子物質作為配體，因此，它具有低廉的成本，吸附容量比較高，通過對吸附和脫附條件的改善能夠使得層析的分辨率提高。原理親和層析的原理類似于酶-底物，***-受體與抗原-抗體等特異性反應的機理。有一定的親和力在每對反應物之間。與在酶與底物的反應中，只有特異的底物才可以結合一定的酶，使復合物產(chǎn)生相同。在親和層析中，只有特異的配體才可以和一定的生命大分子有親和力，并且使復合物產(chǎn)生。親和層析配體呈固相，而酶與底物的反應底物呈液相是它們的不同點。事實上，親和層析是在含有活化基團的基質M上以共價鍵的方式固化具有識別能力的配體L，將固相載體制作成功而固化后的配體束縛特異物質的能力依然保持。所以當在小層析柱裝入固相載體，使得欲分離的樣品在該柱經(jīng)過。此時，樣品中對配體有親和力的物質S就能夠通過結構互補效應、范德瓦爾力與靜電引力等作用在固相載體上吸附著。北京專業(yè)蛋白純化系統(tǒng)上門維修</p><p style="text-indent:25px">蘇州英賽斯智能科技有限公司致力于儀器儀表，是一家生產(chǎn)型公司。公司業(yè)務分為蛋白純化色譜系統(tǒng)，凝膠凈化色譜系統(tǒng)，制備液相色譜，柱塞泵等，目前不斷進行創(chuàng)新和服務改進，為客戶提供良好的產(chǎn)品和服務。公司將不斷增強企業(yè)重點競爭力，努力學習行業(yè)知識，遵守行業(yè)規(guī)范，植根于儀器儀表行業(yè)的發(fā)展。在社會各界的鼎力支持下，持續(xù)創(chuàng)新，不斷鑄造***服務體驗，為客戶成功提供堅實有力的支持。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1932665.html</p></div></div></div></div></div><div id="9b3crbj" class="page-right twoColRt"><div id="lytj8zt" class="box01 margin10 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